Alexei Navalny, Rival to Putin, in Critical Condition After Suspected Poisoning

MOSCOW—Russian opposition politician Alexei Navalny, a fierce critic of President Vladimir Putin and Moscow’s political elite, was admitted to the intensive-care unit at a Siberian hospital after a suspected poisoning left him unconscious, his spokeswoman said.

Mr. Navalny started to feel ill on a flight to Moscow nearly an hour after drinking tea in the airport of the Siberian city of Tomsk early Thursday, Kira Yarmysh told The Wall Street Journal. While in the air, the plane crew searched for a doctor among the passengers.

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